int() function
Blitz3D Forums/Blitz3D Beginners Area/int() function
| ||
| Why on earth does the Int() function round .5 values to the nearest even number? Int(2.5) = 2 Int(3.5) = 4 (I already found a workaround using the Floor() function, but I'm still wondering what the reason could be for the Int to work that way). |
| ||
| I think this has something to do with it... Print 1.5+2.5+3.5+4.5+5.5+6.5 Print Floor(1.5)+Floor(2.5)+Floor(3.5)+Floor(4.5)+Floor(5.5)+Floor(6.5) Print Int(1.5)+Int(2.5)+Int(3.5)+Int(4.5)+Int(5.5)+Int(6.5) WaitKey() |
| ||
| That's just the way the language was designed. Do you expect it to do something other than what the docs say? Int: Converts the value to the nearest integer. Floor: Rounds downward, i.e. in the direction of -Infinity. Ceil: Rounds upward, i.e. in the direction of Infinity. |
| ||
| The nearest number is always up for .5 or above, down for less than .5. The proper results for Int() should be Int(2.5)=3 Int(3.5)=4 The manual explanation should read "Int:Converts the value to the nearest even integer" to accurately describe what Blitz implementation of the function does. |
| ||
| I think it rounds up and down alternatively to decrease floating point error. |
| ||
| It shouldn't though, not according to both the Manual and the traditional implementation of Int() in countless other languages! |
| ||
| It shouldn't though Why not? Operators have different precedence to their real-world counterparts too; unlike C, calculations return the faster type unless you specify otherwise... not all computational standards are necessarily equal. Blitz is mostly used for games, not scientific simulations - keeping floating point error in check in this manner is totally acceptable for a game-oriented language. There's nothing to stop you rolling your own function to behave in the traditional manner if that's what you want. |
| ||
| It shouldn't though, not according to both the Manual Um, I don't know what you're smoking, but the manual does state that it works that way:Int( value ) Parameters: value = a number, or a string which represents a number Description: Converts the value to the nearest integer. This is the same as Blitz's automatic type conversion. So the two commands... n = value n = Int( value ) ... do exactly the same thing when n is an integer variable. If Int is applied to a string it converts as much as possible: Int( "10" ) ........ result is 10 Int( "3.7" ) ....... result is 3, stops at "." which can't be part of an integer Int( "junk3" ) .... result is 0, stops at "j" Int converts floating point numbers by rounding to the nearest integer. NOTE: This is not the traditional meaning of Int in Basic. What about numbers exactly halfway between integers? The rounding is to the nearest even integer: Int( 2.5 ) ... produces 2 Int( 3.5 ) ... produces 4 See also Floor and Ceil for other types of rounding. |
   |